Applied Mechanics and Materials Vols. 541-542

Abstract: Effects of sodium alginate on properties of WPI-NaCas composite films optimized by previous uniform design experiments were investigated. Films were prepared with different concentrations (1%, 2%, 3%) and ratios (1:0, 5:1, 3:1, 1:1, 1:3, 1:5, 0:1, ratio of composite protein solution to sodium alginate solution) of sodium alginate additions. Results suggested increases in water solubility of films and middle diameter, volume-length mean diameter and area-length mean diameter of film-forming solutions. Addition of sodium alginate decreased the gas and water vapor barrier properties of composite films, however, their mechanical properties could be improved by proper usage. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope analysis indicated that protein and sodium alginate presented well interaction and compatibility.

Abstract: In the experiment, the influence of water-cement ratio on the strength of composite material was studied, and the optimal water-cement ratio was 0.45. The influence of different dosages of foam stabilizer on the mechanical properties of composite material was studied, and the optimal dosage of foam stabilizer was 3%. And the influence of different dosages of polymer on the strength and water absorption of composite material was studied, and the optimal dosage of polymer was 1.5%. In this ratio, the compressive strength is 0.53 MPa, flexural strength is 0.39 MPa, 2h water absorption is 41.1%, 24h water absorption is 43.1% and thermal conductivity is 0.048 W/(m·K). Meanwhile, scanning electron microscopy is used to observe the internal morphology of the samples, and the related action mechanism is explored.

Abstract: Multi-elements alloy with good thermal stability is expected to serve as the superheater tube material of ultra-supercritical boiler and may suffer from hot corrosion under the coal-fired atmosphere. In this study, the corrosion resistance behavior of multi-elements alloy CoCrFeNiTi0.5 coated with alkali metal sulfates at 750°C is investigated systematically. The results showed the corrosion kinetics curves of the alloy followed a parabolic growth rate. The corrosion products, which consisted of volatile Na (CrO₄) (SO₄), (Fe,Ni) xSy, Cr/Ti oxide as well as compound oxides with spinel structure AB2O4, were found in the oxide scale and internal attack zone of the alloy. The oxide layer had good adhesion with the matrix at the beginning of corrosion. Prolonging corrosion time, the oxide layer in thickness increased and became loose as well as porous. The micro-pores generated in the interface between the oxide scale and matrix with the occurrence of the internal oxidation and internal sulfidation. In a word, the corrosion resistance behavior of multi-elements alloy CoCrFeNiTi0.5 at 750°C can be attributed to the formation of the protective oxide layers and to the basic fluxing in molten Na₄SO₄ induced by low melting point eutectic.

Abstract: In the experiment, polystyrene particles were used as lightweight aggregate to prepare lightweight composite insulation board which was mixed with fibers and waterproofing agent. The effect of water-cement ratio and volume ratio of polystyrene particles and cement on the density and mechanical properties of polystyrene insulation board was researched. And styrene-acrylic emulsion, stearic acid emulsion and composite emulsion waterproofing agent were used respectively to modify the waterproof of insulation board. Besides, the underlying action mechanism was explored. The results show that the optimum volume ratio was 5:1, and the optimum water-cement ratio was 0.45. And when the content of composite emulsion waterproofing agent was 8%, the 2h and 24h water absorption were 6.0% and 8.1% respectively.

Abstract: Phototherapy as a promising therapy has attracted great attention due to its significant effect on tumor cells with low damage of normal tissue simultaneously, the crucial technology of which is preparation of multifunctional photo-thermal nanomaterials. In this paper , the current research status of the main nanomaterials were reviewed including gold-based nanomaterials and carbon-based nanomaterials for their preparation methods, properties, absorption of near-infrared light and disadvantages. Moreover, the problems and challenges to be solved in this field were also analyzed.

Abstract: The viscosity of dimethylbenzene and imidazole ionic liquids (1-butyl-3-methylimidazolium tetrafluoroborate [Bmi [BF₄] and 1-butyl-3-methylimidazolium hexafluorophosphate [Bmi [PF₆]) was measured. Within the temperature range from 298.15 K to 308.15 K, the viscosity of the four binary systems decreased sharply as the raise of temperature. The viscosity values decrease slowly in the temperature range from 308.15 K to 338.15 K. The viscosity of dimethylbenzene in the ionic liquids was in sequence: [Bmi [BF₄] < [Bmi [PF₆]. The experimental viscosity values had been correlated using the binary parameters of Vogel-Fulcher-Tamman equation.Keywords: viscosity, dimethylbenzene, [Bmi [BF₄], [Bmi [PF₆]

Abstract: This paper analyzes the TTT and CCT curves of U75V as a research basis, detailed anatomical U75V chemical properties and grain structure, through thermal simulation machine, heating 820 °C, respectively, and 920 °C, respectively, the sample detection U75V 2 °C / s, 4 °C / s, 6 °C / s, 10 °C / s, 15 °C / s, 20 °C / s speeds cooled Rockwell hardness, and observing samples taken U75V phase diagram. Through data analysis and image contrast, pearlite lamellar microstructure observation, analysis hardness and lamellar spacing, summed pairs of different cooling rates U75V organizations and hardness.

Abstract: In this article, UV effect onto polysiloxane-modified-polyacrylates and asphalt were researched. For polysiloxane-modified-polyacrylates, it was found that the by adding photosensitive monomers UV can enhance the cross link between molecules, and there is an optimum ratio. For the asphalts, UV will make the materials ageing, because it will break the large molecules into smaller ones. And addition of anti-UV ageing agents may but not necessarily help the anti-ageing process. There is a specific corresponding relationship between them.

Abstract: TPA was synthesized by a two step reaction. Firstly, water-soluble coal acids (CA) was obtained by oxygen-oxidation at 260°C in all aqueous solution of potassium hydroxide, and then crud TPA was got by isomerization of the CA with the existence of CdCO₃ catalyst and CO₂ pressure. The optimum reaction conditions to get crude TPA were 4% amount of CdCO₃ catalyst, and reacted at 420°C with initial 3.0MPa CO₂ pressure. Pure TPA was obtained by a separation step and the yield of pure TPA is 37.16% (based on CA). Furthermore, DOTP was synthesized by the refined TPA and isooctanol. The influence of mole ratio of TPA and isooctanol, amount of catalyst and reaction time on the final yield of DOTP were discussed. The purity of TPA was detected by HPLC and DOTP was detected by FT-IR, ¹H-NMR to get confirmatory results.

Abstract: In this paper self-leveling floor material with flue gas desulfurization (FGD) gypsum was studied. Gypsum-based self-leveling materials was prepared with desulfurization gypsum as binder and added fly ashadmixture Aadmixture B and four kinds of water reducing agents. The result indicated that HC multi-carboxylic acid based super plasticizer demonstrates excellent workability and better compatibility with gypsum, when its content was 1.0%, the fluidity of slurry met the demands of 145mm±5mm. Adding re-dispersible polymer powder to enhance the strength of desulfurization gypsum, the results showed that when its content was 3%, the adhesive strength of sample was increased to 1.21MPa that could meet the performance requirements of self-leveling floor material.